Micrometer mounting



MICROMETER MOUNTING Filed Aug. 25, 1953 Janka/yer BY ATTORNEY United States Patent 2,788,580 MICROMETER MOUNTING Jack Myer, San Francisco, Calif. Application August 25, 1953, Serial No. 376,390

4.Claims. (Cl. 33*167) The present invention relates to improvements in a micrometer mounting, and has particular reference to the mounting of a micrometer with respect to a boring bar used for boring the main hearings in a cylinder block, the principal object of the invention being to insure a correct setting for the boring tool used in connection with the boring bar.

It is a further object of the invention to provide a mounting of the character described which is easily ap plied to the boring bar and which automatically adjusts itself to the proper position for lining up the anvil of the micrometer with respect to the boring tool.

It is further proposed to provide for a simple clamping action whereby the micrometer is secured radially upon the boring bar while straddling the end of the boring tool, the clamping means operating against a spring while forced over the bar and being guided into correct position by the other end of the boring tool.

And finally, it is proposed to provide for mounting means of the character described which may be readily attached to a type of micrometer now in general use, and which will greatly facilitate the proper setting of a series of tools on the same bar, will allow a single person to quickly and expeditiously perform the operation, and will greatly reduce the time necessary for adjusting the difi'erent tools accurately to the same setting.

Further objects and advantages of my invention will appear as the specification proceeds, and the new and useful features of my micrometer mounting will be fully defined in the claims attached hereto.

The preferred form of my invention is illustrated in the accompanying drawing, forming part of this application, in which:

Figure 1 shows a side view of the mounting as applied to a boring bar, the micrometer being shown in dotted lines;

Figure 2, an end view of the same;

Figure 3, a top plan view as seen from line 3-3 of Figure 1; and

Figure 4. a bottom plan view of the same.

While I have shown only the preferred form of my invention, I wish to have it understood that various changes or modifications may be made within the scope of the claims attached hereto, without departing from the spirit of the invention.

Referring to the drawing in detail, the boring bar 1, which is circular in cross-section, and which may be 62 inches or 80 inches long, depending upon the length of the cylinder block, has a number of boring tools 2 slidable transversely therein, only one of the boring tools being shown.

The boring tool is held against rotary motion in the bar by means of a set screw 3 operating in a groove 4 in the boring tool, and may be locked in adjusted position by tightening the set screw.

The cutting edge 5 of the boring tool engages in the ain bearing (not shown) to effect the proper cut, and the main object of the invention is to effect a proper set- 2 tingof the boring. tool by mean'sof'thc micrometer 6, shown in dotted lines.

The micrometer is of conventional construction and comprises a fixed member 7 and a member 8 threaded thereon, the latter member having an anvil 9 movable between. the legs 10 of the fixed member and adapted for correct setting with respect to the axis of the bar by operationof the movable member 8, and observation of :tlie micrometer reading indicated at 11.

The bottom ends of the legs 10 of the fixed member of the micrometer terminate in a pair of V-shaped blocks 12 adapted to bear against the boring bar in straddling relation to the cutting end of the boring tool. For holdingfithe blocks to. the bar, I provide a clamp 13 having a pair of bearing shoes13 adapted to engage underneath the bar on opposite sides of the lower end of the boring tool.

The clamp, which is generally cylindrical in form to fit around the bar 1, terminates, at its upper end, in a pair of cylinders 14 disposed on opposite sides of the fixed member of the micrometer, and these cylinders are pivoted to pins 15 projecting sidewise from the said fixed member, with freedom of sliding motion in slots 16 in the cylinders.

Springs 17 disposed in the cylinders and bearing against the pins 15 and set screws 18 in the upper ends of the cylinders, oppose downward sliding movement of the cylinders, and the tension of the springs may be adjusted by adjustment of the set screws 18.

The two shoes of the clamp, in their lower ends, form a slot 19 into which the lower end of the tool 2 has a nice sliding fit, and the inner end 20 of the slot serves as a stop for the shoes to bring the cutting end of the tool opposite the anvil when the shoes are fully engaged upon the bar.

In use, with the tool 2 applied to the bar 1 in approximately correct position, and with the anvil of the micrometer adjusted to the correct reading, and with the clamp 13 swung into an out of the way position, as shown in dotted lines in Figure 2, the operator places the V-blocks 12 on the bar 1 on opposite sides of the cutter end 5 of the tool.

The operator then squeezes the clamp 13 upon the lower face of the bar 1, the shoes of the clamp being guided automatically on opposite sides of the lower end of the tool 2 and stopping automatically when the end 20 of the slot reaches the tool 2.

This brings the cutting end of the tool opposite the anvil. The operator then merely pushes the tool up against the anvil, locks the tool by operation of the set screw 3 and snaps the clamp out of the way for the next operation.

I claim:

1. Means for mounting a micrometer with respect to a boring bar comprising a clamp resiliently pivoted to opposite sides of the micrometer and operable for clamping around the bar in opposing relation to the micrometer, the clamp having a pair of spaced bearing shoes having a sliding fit with a boring tool extending through the bar and having an abutment between the shoes forming a stop against said tool.

2. In combination, a micrometer having a pair of pins projecting sidewise from the body thereof in opposite directions, a pair of cylinders arranged on opposite sides.

of the micrometer body and having longitudinally slotted walls slidable on the pins, resilient means bearing on the pins and the cylinders and active on the cylinders for urging corresponding ends of the latter in one direction, and a clamp secured upon the other ends of the cylinders and operable for movement in the opposite direction against the opposition of the resilient means.

' 3. In combination, a micrometer having a pair of pins projecting sidewise from the body thereof in opposite directions, a pair of cylinders arranged on opposite sides of the micrometer body and having longitudinally slotted walls slidable on the pins, resilient means bearing on the pins and the cylinders and active on the cylinders for urging corresponding ends of the latter in one direction, and a clamp secured upon the other ends of the cylinders and operable for movement in the opposite direction against the opposition of the resilient means, the resilient means comprising springs mounted in the cylinders and bearing on the pins and set screws threaded into the first-mentioned ends of the cylinders and bearing on the springs.

4. In combination, a micrometer having a pair of pins projecting sidewise from the body thereof in opposite directions, a pair of cylinders arranged on opposite sides of the micrometer body and having longitudinally slotted walls slidable on the pins, resilient means bearing on the pins and the cylinders and active on the cylinders for urging corresponding ends of the latter in one direction, and a clamp secured upon the other ends of the cylinders and operable for movement in the opposite direction against the opposition of the resilient means, the clamp being substantially semi-cylindrical in form for engagement around a boring bar and terminating in a pair of spaced bearing shoes cooperable with a tool extending through the bar in positioning the micrometer with respect to the bar.

References Cited in the file of this patent UNITED STATES PATENTS 1,678,030 Yount July 24, 1928 2,441,716 Mitchell May 18, 1948 FOREIGN PATENTS 410,941 Great Britain May 31, 1934 

